Bug Description

Unity froze after dragging a link to my browser bookmarks bar and passing over the launcher.
Before Unity froze it seemed like it was trying to add the link to the launcher like it does with an application.

Just to clarify, freezing here effectively locks up the entire system. For me, while dragging and dropping any link from Firefox, Firefox hangs (because it is in the midst of drag & drop), and I can't access any other application because the Compiz process is locked up (and Firefox has a mouse grab anyway). Is that the same thing you are experiencing, or should I look a little deeper for those issues?